These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
He's outdone himself. Whovians will never see eggs the same way again.
Recycled Premise: Some claim that Moffat really likes to reuse certain plot elements. Compare Doctor Who's "The Girl in the Fireplace" to the opening of "The Eleventh Hour". In both episodes we find a little girl who has something scary in her house. Then the Doctor shows up and there's a cute scene of him befriending the little girl before tackling the scary thing that's in her house. Then the Doctor leaves not to be seen by the little girl again until she's grown up.
As of Flesh and Stone, this includes monsters using the voices of the dead to communicate.
Years before the new series he wrote a short story called Continuity Errors, in which the Seventh Doctor visits the biggest library in the universe with his companion Benny (not created by Moffat), a snarky archaeologist from the future who knows several incarnations of the Doctor (and possibly sleeps with one of them) and has an important diary. The Doctor needs a particular book to save the universe, but the librarian is a bitter, obstructive person and refuses to help. No problem; the Doctor travels into her past to change history and make her a happier person in the present. At one point he rescues a little girl from a monster in her bedroom and they have an exchange about how "even monsters have nightmares" ("what do monsters have nightmares about?" "Me.") Bits of this have been recycled into at least three different stories.
He stated that he won't make Sherlock asexual because it makes for "boring" television. He's also insisted that Sherlock fans who look for Ho Yay subtext are clearly Doing It Wrong. (Although, given his liking for outright lying to fans, this might just be a move to throw people off.)